Wireless transceiver for transmitting circularly-polarized signals with modulated angular speed

ABSTRACT

A radio frequency (RF) front end chip in a phased array antenna panel for transmitting a modulated circularly-polarized signal is disclosed. The RF front end chip includes an oscillator providing an angular speed modulation signal to a quadrature generation block, the quadrature generation block providing an in-phase signal and a quadrature signal based on the angular speed modulation signal, a first amplifier receiving the in-phase signal and a data signal, and providing a modulated horizontally-polarized signal, and a second amplifier receiving the quadrature signal and the data signal, and providing a modulated vertically-polarized signal, where a modulated circularly-polarized signal is generated based on the modulated horizontally-polarized signal and the modulated vertically-polarized signal. The angular speed modulation signal controls an angular speed of the modulated circularly-polarized signal. The data signal is encoded by the angular speed modulation signal.

The present application is a continuation application of U.S. patent application Ser. No. 15/292,379, titled “Wireless Transceiver Having a Phased Array Antenna Panel for Transmitting Circularly-Polarized Signals with Modulated Angular Speed,” filed on Oct. 13, 2016. The above-identified application is hereby incorporated fully by reference into the present application.

BACKGROUND

Wireless communications systems, such as satellite communications systems, can transmit data using circularly polarized signals. In a conventional wireless transmitter, a horizontally-polarized signal and a vertically polarized signal may be combined to form a circularly-polarized signal before being transmitted by the wireless transmitter. In the conventional wireless transmitter, a horizontally-polarized signal and a vertically-polarized signal are provided directly from a processing unit to a radio frequency (RF) front end chip where the amplitude and phase of the horizontally-polarized signal and the vertically polarized signal may be adjusted before being converted to the circularly-polarized signal for transmission. Thus, the circularly-polarized signal formed in the conventional wireless transmitter has a fixed angular speed. However, modulating the angular speed of a circularly-polarized signal may add additional information to the signal to be transmitted by the wireless transceiver.

Thus, there is a need in the art for a wireless transceiver that can transmit circularly-polarized signals with modulated angular speed.

SUMMARY

The present disclosure is directed to a wireless transceiver having a phased array antenna panel for transmitting circularly-polarized signals with modulated angular speed, substantially as shown in and/or described in connection with at least one of the figures, and as set forth in the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A illustrates a perspective view of a portion of an exemplary wireless transceiver using a phased array antenna panel for transmitting and/or receiving wireless signals according to one implementation of the present application.

FIG. 1B illustrates a top plan view of a portion of an exemplary wireless transceiver using a phased array antenna panel for transmitting and/or receiving wireless signals according to one implementation of the present application.

FIG. 2 illustrates a functional block diagram of a portion of an exemplary wireless transceiver according to one implementation of the present application.

FIG. 3 illustrates a functional circuit diagram of a portion of an exemplary wireless transceiver according to one implementation of the present application.

FIG. 4 illustrates a functional circuit diagram of a portion of an exemplary wireless transceiver according to one implementation of the present application.

DETAILED DESCRIPTION

The following description contains specific information pertaining to implementations in the present disclosure. The drawings in the present application and their accompanying detailed description are directed to merely exemplary implementations. Unless noted otherwise, like or corresponding elements among the figures may be indicated by like or corresponding reference numerals. Moreover, the drawings and illustrations in the present application are generally not to scale, and are not intended to correspond to actual relative dimensions.

FIG. 1A illustrates a perspective view of a portion of an exemplary wireless transceiver using a phased array antenna panel for transmitting and/or receiving wireless signals according to one implementation of the present application. As illustrated in FIG. 1A, wireless transceiver 100 includes substrate 102 having layers 102 a, 102 b and 102 c, phased array antenna panel 104 having a plurality of front end units such as front end units 105 a, 105 b and 105 x (hereinafter collectively referred to as “front end units 105”), and master chip 180.

In the present implementation, substrate 102 may be a multi-layer printed circuit board (PCB) having layers 102 a, 102 b and 102 c and additional layers below layer 102 c that are not explicitly shown. Although only three layers are shown in FIG. 1A, in another implementation, substrate 102 may be a multi-layer PCB having more or less than three layers. Phased array antenna panel 104 having front end units 105 is formed in layer 102 a of substrate 102. In one implementation, substrate 102 of wireless transceiver 100 may include 500 front end units 105, each having a radio frequency (RF) front end chip coupled to a plurality of antennas (not explicitly shown in FIG. 1A). In one implementation, wireless transceiver 100 may include 2000 antennas on phased array antenna panel 104, where each front end unit 105 includes four antennas coupled to an RF front end chip (not explicitly shown in FIG. 1A).

In the present implementation, master chip 180 may be formed in layer 102 c of substrate 102 (which is just below routing layer 102 b and antenna panel layer 102 a). Master chip 180 may be coupled to front end units 105 in layer 102 a using a plurality of buses (not explicitly shown in FIG. 1A) routed through layers 102 a and 102 b of substrate 102, for example. In the present implementation, master chip 180 is configured to provide phase and amplitude control information as well as encoded data information from a digital core in master chip 180 to the RF front end chips in each of front end units 105. For example, master chip 180 may drive in parallel a number of N-bit buses where each N-bit bus is coupled to a respective segment of the front end units.

FIG. 1B illustrates a top plan view of a portion of an exemplary wireless transceiver using a phased array antenna panel for transmitting and/or receiving wireless signals according to one implementation of the present application. As illustrated in FIG. 1B, phased array antenna panel 104 is formed in layer 102 a of a multi-layer substrate, such as substrate 102 in FIG. 1A. Phased array antenna panel 104 includes a plurality of front end units, such as front end units 105 a, 105 b and 105 x (hereinafter collectively referred to as “front end units 105”). In one implementation, layer 102 a, phased array antenna panel 104, front end units 105, and master chip 180 in FIG. 1B may substantially correspond to layer 102 a, phased array antenna panel 104, front end units 105, and master chip 180, respectively, of wireless transceiver 100 in FIG. 1A.

As illustrated in FIG. 1B, each of front end units 105 includes an RF front end chip coupled to a group of four antennas. For example, in front end unit 105 a, RF front end chip 106 a is surrounded by a group of four antennas, namely, antennas 114 a, 114 b, 114 c and 114 d. In one implementation, RF front end unit 105 a having RF front end chip 106 a and antennas 114 a, 114 b, 114 c and 114 d in FIG. 1B may substantially correspond to RF front end unit 105 a in FIG. 1A. Antennas 114 a, 114 b, 114 c and 114 d are coupled to RF front end chip 106 a through antenna feed lines. As can be seen in FIG. 1B, each of front end units 105 of phased array antenna panel 104, such as front end units 105 b and 105 x, includes an RF front end chip coupled to a group of four antennas.

As illustrated in FIG. 1B, master chip 180 may be formed in a layer of a substrate that is different than layer 102 a. In one implementation, master chip 180 in FIG. 1B may substantially correspond to master chip 180 in FIG. 1A, which is formed in layer 102 c of substrate 102, and coupled to front end units 105 in layer 102 a using a plurality of buses (not explicitly shown in FIG. 1B) routed through layers 102 a and 102 b of substrate 102, for example. In the present implementation, master chip 180 is configured to provide phase and amplitude control information as well as encoded data information from a digital core in master chip 180 to the RF front end chips in each of front end units 105. For example, master chip 180 may drive in parallel a number of N-bit buses where each N-bit bus is coupled to a respective segment of the front end units.

FIG. 2 illustrates a functional block diagram of a portion of an exemplary wireless transceiver according to one implementation of the present application. As illustrated in FIG. 2, wireless transceiver 200 includes front end units 205 a, 205 b through 205 x, (hereinafter collectively referred to as front end units 205) and master chip 280. Each of front end units 205 may include an RF front end chip coupled to a plurality of antennas.

As illustrated in FIG. 2, RF front end chip 206 a in front end unit 205 a is coupled to master chip 280 through N-bit bus 210 a for receiving phase and amplitude control information as well as encoded data information. RF front end chip 206 a is electrically coupled to antennas 214 a, 214 b, 214 c and 214 d in front end unit 205 a, where RF front end chip 206 a provides a modulated horizontally-polarized signal and a modulated vertically-polarized signal to each of antennas 214 a, 214 b, 214 c and 214 d, for example. Similarly, RF front end chip 206 b in front end unit 205 b is coupled to master chip 280 through N-bit bus 210 b for receiving phase and amplitude control information as well as encoded data information. RF front end chip 206 b is electrically coupled to antennas 214 e, 214 f, 214 g and 214 h in front end unit 205 b, where RF front end chip 206 b provides a modulated horizontally-polarized signal and a modulated vertically-polarized signal to each of antennas 214 e, 214 f, 214 g and 214 h, for example. In addition, RF front end chip 206 x in front end unit 205 x is coupled to master chip 280 through N-bit bus 210 x for receiving phase and amplitude control information as well as encoded data information. RF front end chip 206 x is electrically coupled to antennas 214 w, 214 x, 214 y and 214 z in front end unit 205 x, where RF front end chip 206 x provides a modulated horizontally-polarized signal and a modulated vertically-polarized signal to each of antennas 214 w, 214 x, 214 y and 214 z, for example.

FIG. 3 illustrates a functional circuit diagram of a portion of an exemplary wireless transceiver according to one implementation of the present application. As shown in FIG. 3, front end unit 305 a includes a plurality of antennas, such as antennas 314 a and 314 d, coupled to RF front end chip 306 a. In one implementation, front end unit 305 a may substantially correspond to front end unit 105 a in FIG. 1B. In one implementation, front end unit 305 a may substantially correspond to front end unit 205 a in FIG. 2. It is noted that, in FIG. 3, some antennas, which would otherwise correspond to antennas 214 b and 214 c in FIG. 2 for example, are omitted for conceptual clarity.

As shown in FIG. 3, front end unit 305 a receives data signals, having phase and amplitude control information as well as encoded data information, from N-bit bus 310 a from a master chip, such as master chip 280 in FIG. 2. The data signals are provided to one or more transmit circuits in RF front end chip 306 a, which provides a modulated horizontally-polarized signal and a modulated vertically-polarized signal to each of the antennas coupled thereto. The antennas, such as antennas 314 a and 314 d may be configured to transmit signals to one or more wireless receivers, such as commercial geostationary communication satellites or low earth orbit satellites having a very large bandwidth in the 10 GHz to 20 GHz frequency range and a very high data rate. In another implementation, antennas 314 a and 314 d may be configured to transmit signals in the 60 GHz frequency range, sometimes referred to as “60 GHz communications,” which involve transmission and reception of millimeter wave signals. Among the applications for 60 GHz communications are wireless personal area networks, wireless high-definition television signal and Point-to-Point links. Also, RF front end chip 306 a may also include receive circuits for receiving signals from one or more antennas. The receive circuits are omitted from RF front end chip 306 a for conceptual clarity.

As illustrated in FIG. 3, N-bit bus 310 a carrying data signals having phase information, amplitude information and encoded data information from a master chip, is provided to transmit circuit 320 a in RF front end chip 306 a. Transmit circuit 320 a includes phase shifters 324 aH and 324 aV, amplifiers 322 aH and 322 aV, oscillator 340 a and quadrature generation block 344 a. For example, data signal 330 aH having phase information, amplitude information and encoded data information is provided to phase shifter 324 aH, where data signal 330 aH may be phase shifted by phase shifter 324 aH to form phase shifted data signal 332 aH. Phase shifted data signal 332 aH from phase shifter 324 aH is provided to amplifier 322 aH. In addition, oscillator 340 a provides angular speed modulation signal 342 a to quadrature generation block 344 a, which provides in-phase signal 346 aH and quadrature signal 346 aV based on angular speed modulation signal 342 a to amplifiers 322 aH and 322 aV, respectively. Amplifier 322 aH combines phase shifted data signal 332 aH from phase shifter 324 aH and in-phase signal 346 aH from quadrature generation block 344 a, and provides modulated horizontally-polarized signal 348 aH to antenna 314 a. In addition, data signal 330 aV having phase information, amplitude information and encoded data information is provided to phase shifter 324 aV, where data signal 330 aV may be phase shifted by phase shifter 324 aV to form phase shifted data signal 332 aV. Phase shifted data signal 332 aV from phase shifter 324 aV is provided to amplifier 322 aV. Amplifier 322 aV combines phase shifted data signal 332 aV from phase shifter 324 aV and quadrature signal 346 aV from quadrature generation block 344 a, and provides modulated vertically-polarized signal 348 aV to antenna 314 a. In one implementation, antenna 314 a may combine modulated horizontally-polarized signal 348 aH and modulated vertically-polarized signal 348 aV, and generate a modulated circularly-polarized signal for transmission, where angular speed modulation signal 342 a controls an angular speed of the modulated circularly-polarized signal. In one implementation, data signals 330 aH and 330 aV may carry the same data from the master chip; while in another implementation data carried by data signal 330 aH can be different from data carried by data signals 330 aV.

As further illustrated in FIG. 3, N-hit bus 310 a carrying data signals, having phase information, amplitude information and data information from the master chip, is provided to transmit circuit 320 d in RF front end chip 306 a. Transmit circuit 320 d includes phase shifters 324 dH and 324 dV, amplifiers 322 dH and 322 dV, oscillator 340 d and quadrature generation block 344 d. For example, data signal 334 dH having phase information, amplitude information and encoded data information is provided to phase shifter 324 dH, where data signal 334 dH may be phase shifted by phase shifter 324 dH to form phase shifted data signal 336 dH. Phase shifted data signal 336 dH from phase shifter 324 dH is provided to amplifier 322 dH. In addition, oscillator 340 d provides angular speed modulation signal 342 d to quadrature generation block 344 d, which provides in-phase signal 346 dH and quadrature signal 346 dV based on angular speed modulation signal 342 d to amplifiers 322 dH and 322 dV, respectively. Amplifier 322 dH combines phase shifted data signal 336 dH from phase shifter 324 dH and in-phase signal 346 dH from quadrature generation block 344 d, and provides modulated horizontally-polarized signal 348 dH to antenna 314 d. In addition, data signal 334 dV having phase information, amplitude information and encoded data information is provided to phase shifter 324 dV, where data signal 334 dV may be phase shifted by phase shifter 324 dV to form phase shifted data signal 336 dV. Phase shifted data signal 336 dV from phase shifter 324 dV is provided to amplifier 322 dV. Amplifier 322 dV combines phase shifted data signal 336 dV from phase shifter 324 dV and quadrature signal 346 dV from quadrature generation block 344 d, and provides modulated vertically-polarized signal 348 dV to antenna 314 d. In one implementation, antenna 314 d may combine modulated horizontally-polarized signal 348 dH and modulated vertically-polarized signal 348 dV, and generate a modulated circularly-polarized signal for transmission, where angular speed modulation signal 342 d controls an angular speed of the modulated circularly-polarized signal. In one implementation, data signals 334 dH and 334 dV may carry the same data from the master chip; while in another implementation data carried by data signal 334 dH can be different from data carried by data signals 334 dV.

In one implementation, oscillator 340 a may be a voltage controlled oscillator. In one implementation, amplifiers 322 aH, 322 aV, 322 dH and 322 dV may each be a power amplifier. In another implementation, amplifiers 322 aH, 322 aV, 322 dH and 322 dV may each be a variable gain amplifier. In one implementation, oscillator 340 a in transmit circuit 320 a and oscillator 340 d in transmit circuit 320 d may respectively provide angular speed modulation signals 342 a and 342 d, which may have different angular speed modulation frequencies, such that the respective modulated circularly-polarized signals transmitted by antennas 314 a and 314 d may have different angular speeds. In another implementation, oscillator 340 a in transmit circuit 320 a and oscillator 340 d in transmit circuit 320 d may respectively provide angular speed modulation signals 342 a and 342 d, which may have the same angular speed modulation frequency. It should be noted that although only transmit circuits such as transmit circuits 320 a and 320 d are shown in RF front end chip 306 a, RF front end chip 306 a may also include receive circuits (not explicitly shown in FIG. 3) for receiving signals from one or more antennas and providing the received signals to the master chip.

FIG. 4 illustrates a functional circuit diagram of a portion of an exemplary wireless transceiver according to one implementation of the present application. As shown in FIG. 4, RF front end chip 406 a includes transmit circuit 420 a coupled to antenna 414 a. In one implementation, RF front end chip 406 a may substantially correspond to RF front end chip 106 a in FIG. 1B. In one implementation, RF front end chip 406 a may substantially correspond to RF front end chip 206 a in FIG. 2. In one implementation, RF front end chip 406 a may substantially correspond to RF front end chip 306 a in FIG. 3. It is noted that, in FIG. 4, some antennas and their corresponding transmit circuits are omitted from RF front end chip 406 a for conceptual clarity. Also, RF front end chip 406 a may also include receive circuits for receiving signals from one or more antennas. The receive circuits are omitted from RF front end chip 406 a for conceptual clarity.

As shown in FIG. 4, RF front end chip 406 a receives data signals from N-bit bus 410 a from a master chip, such as master chip 180 in FIG. 1B or master chip 280 in FIG. 2. N-bit bus 410 a carrying data signals having phase information, amplitude information and encoded data information, for example, from the master chip is provided to transmit circuit 420 a. Transmit circuit 420 a includes phase shifters 424 aH and 424 aV, amplifiers 422 aH and 422 aV, oscillator 440 a and quadrature generation block 444 a.

As shown in FIG. 4, data signal 430 aH is provided to phase shifter 424 aH, where data signal 430 aH may be phase shifted by phase shifter 424 aH to generate phase shifted data signal 432 aH. In the present implementation, phase shifted data signal 432 aH carries the term, sin(ω_(C)t), where ω_(C) is the carrier frequency of a modulated circularly-polarized signal to be transmitted by antenna 414 a. Phase shifted data signal 432 aH from phase shifter 424 aH is provided to amplifier 422 aH. In addition, oscillator 440 a provides angular speed modulation signal 442 a to quadrature generation block 444 a. In the present implementation, angular speed modulation signal 442 a carries the term, sin(ω_(AS)t), where ω_(AS) is the angular speed modulation frequency that controls the angular speed of the modulated circularly-polarized signal to be transmitted by antenna 414 a. As illustrated in FIG. 4, quadrature generation block 444 a generates in-phase signal 446 aH and quadrature signal 446 aV based on angular speed modulation signal 442 a, where in-phase signal 446 aH includes the term, sin(ω_(AS)t), while quadrature signal 446 aV includes the term, cos(ω_(AS)t), which in-phase signal 446 aH and quadrature signal 446 aV are 90-degree out of phase with each other.

As illustrated in FIG. 4, amplifier 422 aH combines phase shifted data signal 432 aH having the term, sin(ω_(C)t), from phase shifter 424 aH and in-phase signal 446 aH having the term, sin(ω_(AS)t), from quadrature generation block 444 a, and provides modulated horizontally-polarized signal 448 aH to antenna 414 a. In one implementation, modulated horizontally-polarized signal 448 aH may include the term, sin(ω_(AS)t)·sin(ω_(C)t).

In addition, data signal 430 aV having phase information, amplitude information and encoded data information is provided to phase shifter 424 aV, where data signal 430 aV may be phase shifted by phase shifter 424 aV to form phase shifted data signal 432 aV. In the present implementation, phase shifted data signal 432 aV also carries the term, sin(ω_(C)t), where ω_(C) is the carrier frequency of the modulated circularly-polarized signal to be transmitted by antenna 414 a. Phase shifted data signal 432 aV from phase shifter 424 aV is provided to amplifier 422 aV.

It should be noted that, in contrast to a conventional transmit circuit where a horizontal-polarization path and a vertical-polarization path receive an in-phase signal and a quadrature signal, respectively, from a processing unit, in transmit circuit 420 a, N-bit bus 410 a provides a signal, for example, having the term, sin(ω_(C)t) to both the horizontal-polarization path and the vertical-polarization path. Thus, phase shifted data signal 432 aH in the horizontal-polarization path and phase shifted data signal 432 aV in the vertical-polarization path both carry the term, sin(ω_(C)t), which is provided from the master chip, for example.

As illustrated in FIG. 4, quadrature generation block 444 a generates in-phase signal 446 aH and quadrature signal 446 aV based on angular speed modulation signal 442 a, and provides quadrature signal 446 aV having the term, cos(ω_(AS)t), to amplifier 422 aV. Amplifier 422 aV combines phase shifted data signal 432 aV having the term, sin(ω_(C)t), from phase shifter 424 aV and quadrature signal 446 aV having the term, cos(ω_(AS)t), from quadrature generation block 444 a, and provides modulated vertically-polarized signal 448 aV to antenna 414 a. In one implementation, modulated vertically-polarized signal 448 aV may include the term, cos(ω_(AS)t)·sin(ω_(C)t). In one implementation, amplifiers 422 aH and 422 aV may each be a power amplifier. In another implementation, amplifiers 422 aH and 422 aV may each be a variable gain amplifier.

In one implementation, modulated horizontally-polarized signal 448 aH and modulated vertically-polarized signal 448 aV are combined to form a modulated circularly-polarized signal, which may be transmitted by antenna 414 a. In one implementation, modulated horizontally-polarized signal 448 aH and modulated vertically-polarized signal 448 aV may be combined in antenna 414 a. In another implementation, modulated horizontally-polarized signal 448 aH and modulated vertically-polarized signal 448 aV may be combined in RF front end chip 406 a before being sent to antenna 414 a. In one implementation, the modulated circularly-polarized signal may be a right-handed modulated circularly-polarized signal or a left-handed modulated circularly-polarized signal. In one implementation, data signals 430 aH and 430 aV may carry the same data from the master chip; while in another implementation data carried by data signal 430 aH can be different from data carried by data signals 430 aV.

In the present implementation, angular speed modulation signal 442 a generated by oscillator 440 a controls the angular speed of the modulated circularly-polarized signal. In one implementation, oscillator 440 a is a voltage controlled oscillator. In one implementation, oscillator 440 a is configured to vary the angular speed of the modulated circularly-polarized signal to be transmitted by antenna 414 a. By controlling the angular speed using oscillator 440 a and quadrature generation block 444 a, transmit circuit 420 a can encode data signal 430 aH and/or 430 aV with angular speed modulation signal 442 a, which may provide additional information, such as security information or encryption information in the modulated circularly-polarized signal. As such, only a wireless receiver with knowledge of the modulated circularly-polarized signal with modulated angular speed may receive and decode information from the modulated circularly-polarized signal.

From the above description, it is manifest that various techniques can be used for implementing the concepts described in the present application without departing from the scope of those concepts. Moreover, while the concepts have been described with specific reference to certain implementations, a person of ordinary skill in the art would recognize that changes can be made in form and detail without departing from the scope of those concepts. As such, the described implementations are to be considered in all respects as illustrative and not restrictive. It should also be understood that the present application is not limited to the particular implementations described above, but many rearrangements, modifications, and substitutions are possible without departing from the scope of the present disclosure. 

The invention claimed is:
 1. A wireless transmitter using a phased array antenna panel for transmitting wireless signals comprising: a radio frequency (RF) front end chip coupled to an antenna in said phased array antenna panel; said RF front end chip comprising an oscillator providing an angular speed modulation signal to a quadrature generation block; said RF front end chip receiving a data signal from a master chip, and being configured to combine said data signal with said angular speed modulation signal to provide a modulated polarized signal for transmission by said antenna in said phased array antenna panel.
 2. The wireless transmitter of claim 1 wherein said quadrature generation block provides an in-phase signal and a quadrature signal based on said angular speed modulation signal.
 3. The wireless transmitter of claim 1 wherein said data signal is encoded by said angular speed modulation signal.
 4. The wireless transmitter of claim 1 wherein said angular speed modulation signal controls an angular speed of said modulated polarized signal.
 5. The wireless transmitter of claim 1 wherein said oscillator is a voltage controlled oscillator.
 6. The wireless transmitter of claim 1 wherein said modulated polarized signal is a right-handed modulated circularly-polarized signal or a left-handed modulated circularly-polarized signal.
 7. The wireless transmitter of claim 1 wherein said master chip is integrated in said phased array antenna panel. 